Android Question The same java code does not work properly in b4x

[mywmshow]

I have an SDK access code. Everything is normal in as, but it cannot be used correctly in b4x. I use logcat to check the log and find an error in init. Prompt: com qq. e.comm.managers. plugin. e: Fail to init GDTADPLugin,PluginClassLoader == null; while loading factory impl for:interface
There is engineering code in the attachment. Please help me. Thank you very much!

Demo download
http://www.xxtapp.top/Demo.zip

public void onClick(View v) {
        if(v.getId()==R.id.button)
        {
            Toast.makeText(this, "Init", Toast.LENGTH_SHORT).show();
            GDTAdSdk.init(getApplicationContext(),"1200014716");
        }

        if(v.getId()==R.id.button2)
        {
            UnifiedInterstitialADListener iadListener = new UnifiedInterstitialADListener () {
                @Override
                public void onADReceive() {
                    iad.show();
                }

                @Override
                public void onVideoCached() { }

                @Override
                public void onNoAD(AdError error) {
                    Toast.makeText(getApplicationContext(), error.getErrorCode()+error.getErrorMsg(), Toast.LENGTH_SHORT).show();
                }

                @Override
                public void onADOpened() { }

                @Override
                public void onADExposure() { }

                @Override
                public void onADClicked() { }

                @Override
                public void onADLeftApplication() { }

                @Override
                public void onADClosed() { }

                @Override
                public void onRenderSuccess() { }

                @Override
                public void onRenderFail() { }
            };

            iad = new UnifiedInterstitialAD(this, "5062326323029403", iadListener);
            iad.loadAD();
        }
    }

Sub Button1_Click
    Dim jo As JavaObject
    jo.InitializeContext
    jo.RunMethod("Init",Null)
End Sub

Sub Button2_Click
    Dim jo As JavaObject
    jo.InitializeContext
    jo.RunMethod("Show",Null)
End Sub

#if java

//SDK
import com.qq.e.comm.util.AdError;
import com.qq.e.comm.managers.GDTAdSdk;
import com.qq.e.ads.interstitial2.UnifiedInterstitialAD;
import com.qq.e.ads.interstitial2.UnifiedInterstitialADListener;

private UnifiedInterstitialAD iad;

public void Init() {
    processBA.Log("init");
    GDTAdSdk.init(this, "1200014716");
}

public void Show() {
        UnifiedInterstitialADListener  iadListener = new UnifiedInterstitialADListener () {
            @Override
            public void onADReceive() {
                iad.show();
            }

            @Override
            public void onVideoCached() {}

            @Override
            public void onNoAD(AdError error) {
                processBA.Log(error.getErrorCode()+error.getErrorMsg());
            }

            @Override
            public void onADOpened() {}
            
            @Override
            public void onADExposure() {}

            @Override
            public void onADClicked() {}
            
            @Override
            public void onADLeftApplication() {}
            
            @Override
            public void onADClosed() {}
            
            @Override
            public void onRenderSuccess() {}   
            
            @Override
            public void onRenderFail() {}
        };

        iad = new UnifiedInterstitialAD(this, "5062326323029403", iadListener);
        iad.loadAD();
}   
#End If